What are the perfect office hours for our body clocks?

Two-thirds of people in Britain say they would prefer an earlier start and finish to the working day, but for many it might be better to opt for later hoursWhat time we start and finish work is a much more important issue than it used to be. Gone are the rigid days of working standard office hours, as eulogised in song by Dolly Parton. More of us are being given a choice of when we work, especially those who work from home. And later starting times in schools have been found to safeguard teenage